CHEM IGCSE HARD EXAM QUESTIONS AND ANSWERS 100- SOLVED (Newest 2025)

CHEM IGCSE HARD EXAM QUESTIONS
AND ANSWERS 100% SOLVED (Newest
2025)
How to prepare a pure dry sample of lead - Correct Answers
✅-dissolve both items in water
-Mix both
-Filter it
-Wash residue
-dry on filter


Why is the test tube placed with cold water and ice - Correct
Answers ✅- to cool gas and condense it


Redox reactions - Correct Answers ✅chemical reaction with
oxidation and reduction processes


why would something be ductile - Correct Answers ✅the
layers of positive ions slide over each other


Alkali metals reaction with water
Lithium
sodium
potassium
Rubidium and Caesium - Correct Answers ✅metal
hydroxide+ hydrogen

, CHEM IGCSE HARD EXAM QUESTIONS
AND ANSWERS 100% SOLVED (Newest
2025)
Lithium: h2 gas bubbles


Sodium" H2 gas bubbles, floats , melts, disappear


Potassium:Bubbles
melts into a shiny ball
lilac flame produced


Rb and cb: explosive sparks
violent explosion


Alkali metals reaction with air - Correct Answers ✅Lithium:
burn with red flame
Sodium: burn with yellow
Potassium" burn with lilac


reactions with oxygen
magnesium
hydrogen
sulphur - Correct Answers ✅mg: white flame
hydrogen: water
sulphur: blue flame